NCP1342: Quasi-Resonant Flyback Controller with Valley Lock-Out Switching

Description:

The NCP1342 is a highly integrated quasi-resona...

  • The NCP1342 is a highly integrated quasi-resonant flyback controller suitable for designing high-performance off-line power converters. With an integrated active X2 capacitor discharge feature, the NCP1342 can enable no-load power consumption below 30 mW.

    The NCP1342 features proprietary valley-lockout circuitry, ensuring stable valley switching. This system works down to the 6th valley and transitions to frequency foldback mode to reduce switching losses. As the load decreases further, the NCP1342 enters quiet-skip mode to manage the power delivery while minimizing acoustic noise.

    To ensure light load performance with high frequency designs, the NCP1342 incorporates Minimum Peak Current Modulation (MPCM) to reduce the switching frequency quickly. To help ensure converter ruggedness, the NCP1342 implements several key protective features such as internal brownout detection, a non-dissipative Over Power Protection (OPP) for constant maximum output power regardless of input voltage, a latched overvoltage and NTC-ready overtemperature protection through a dedicated pin, and line removal detection to safely discharge the X2 capacitors when the ac line is removed.

  • Features
  • Minimum Peak Current Modulation for Rapid Frequency Foldback (RFF) - Fast reduction of switching frequency for improved light load efficiency
  • QR Frequency Jittering - Reduces EMI Signature
  • Quiet-Skip Technology - Ensures Operation Outside Audible Range
  • Integrated HV Startup with Brownout Protection - Provides an efficient power-on source and protects against drops in input mains voltage
  • Valley Switching Operaton with Valley Lockout - Maximizes the efficiency over the entire power range
  • Integrated X2 Capacitor Discharge Capability - Eliminates the need for a X2 resistor
  • NTC Compatible Fault Pin - Extra protection against high temperature or other fault conditions
  • High Drive Capability: -500 mA / +800 mA - Enables faster switching of primary-side MOSFET
  • Latch input for OVP and OTP implementation - Simple implementation of required protection functions
  • Applications
  • Medium or High Power AC-DC Adapters
  • Ultra High Density AC-DC Adapters
  • USB PD Compliant
  • End Products
  • Notebook Adapters
  • Flat TV SMPS
  • Computer Power Supplies
  • Phone and Tablet Adapters
  • Technical Documentation & Design Resources
    Evaluation/Development Tool Information
    Availability and Samples
    NCP1342AMAACD1R2G
  • Status: Active
  • Compliance: Pb-free Halide free 
  • Description: Quasi-Resonant Flyback Controller with Valley Lock-Out Switching
  • Package Type: SOIC9 NB
  • Package Case Outline: 751BP
  • MSL: 1
  • Container Type: REEL
  • Container Qty: 2500
  • NCP1342AMDCCDR2G
  • Status: Active
  • Compliance: Pb-free Halide free 
  • Description: Quasi-Resonant Flyback Controller with Valley Lock-Out Switching
  • Package Type: SOIC-8
  • Package Case Outline: 751-07
  • MSL: 1
  • Container Type: REEL
  • Container Qty: 2500
  • Inventory

  • Market Leadtime (weeks):2 to 4
  • Arrow:0
  • ON Semiconductor:22,500
  • NCP1342AMDCDAD1R2G
  • Status: Active
  • Compliance: Pb-free Halide free 
  • Description: Quasi-Resonant Flyback Controller with Valley Lock-Out Switching
  • Package Type: SOIC9 NB
  • Package Case Outline: 751BP
  • MSL: 1
  • Container Type: REEL
  • Container Qty: 2500
  • NCP1342ANDAAD1R2G
  • Status: Active
  • Compliance: Pb-free Halide free 
  • Description: Quasi-Resonant Flyback Controller with Valley Lock-Out Switching
  • Package Type: SOIC9 NB
  • Package Case Outline: 751BP
  • MSL: 1
  • Container Type: REEL
  • Container Qty: 2500
  • NCP1342DADBDD1R2G
  • Status: Active
  • Compliance: Pb-free Halide free 
  • Description: Quasi-Resonant Flyback Controller with Valley Lock-Out Switching
  • Package Type: SOIC9 NB
  • Package Case Outline: 751BP
  • MSL: 1
  • Container Type: REEL
  • Container Qty: 2500
  • Inventory

  • Market Leadtime (weeks):2 to 4
  • Arrow:0
  • ON Semiconductor:165,000
  • Specifications
  • Topology: Flyback 
  • Control Mode: Current Mode 
  • fsw Typ (kHz): variable  Variable 
  • Stand-by Mode: Yes 
  • UVLO (V):
  • Short Circuit Protection: Yes 
  • Latch: No  Yes 
  • Soft Start: Yes 
  • VCC Max (V): 30 
  • Drive Cap. (mA): 500 / 800 
  • Package Type: SOIC9 NB  SOIC-8 
  • ON Semiconductor Full Web Site